Pellet fuel combustion device

ABSTRACT

This invention discloses a pellet fuel combustion device, which comprises an electric arc ignition pin installed in the combustion chamber to generate high-voltage electric arc. The pellet fuels transported by the feeding mouth start burning once they touch the electric arc. High-voltage electric arc is generated by electric arc ignition pin the moment the pellet fuel combustion device starts up, which accelerates igniting speed greatly and reduces power consumption. Furthermore, the fuel pellets can achieve full burning by scattering and touching electric arc without bringing on smeek. Hence, this invention has great advantages over conventional ignitions which produce heat and fire by resistance wire.

TECHNICAL FIELD

This invention relates to a combustion device and, more particularly to a pellet fuel combustion device.

BACKGROUND OF THE INVENTION

Pellet fuel combustion device is a device for burning biomass pellet fuels. It can burn biomass product made of crop stalks, straws and leave after being ground and pressed, which makes full use of all kinds of biomass waste as well as saves conventional energy. As it were, pellet fuel points a new way for energy saving and environmental protection.

The working principle of the pellet fuel combustion device is that the ignition ignites pellet fuels, and a blower supplys the combustion chamber with oxygen by blasting air to burn the fuels. Conventional ignitions heat up pellet fuels to their combustion temperature and ignite them by the heat produced by resistance wire. In this way, the power consumption of conventional ignitions is comparatively large with long ignition time and a lot of smeek.

SUMMARY OF THE INVENTION

To solve the problems above, the invention presents a pellet fuel combustion device with low ignition power, fast ignition speed but no smeek.

The technical solution of the invention is a pellet fuel combustion device comprising

a combustion chamber, which is used to burn pellet fuels equipped with a feeding mouth on the sidewall;

a fuel delivery system, which is used to feed pellet fuels into the combustion chamber, the output of which connects to the feeding mouth.

an electric arc ignition system, which is used to produce electric arc to burn the pellet fuels delivered into the combustion chamber through the fuel delivery system.

Further, the said electric arc ignition system comprises:

an electric arc ignition pin, which is used to produce electric arc by electric energy;

a power supplying equipment, which is used to supply the electric arc ignition pin with power.

The said fuel delivery system further comprises:

a fuel storage chamber, which is used to store pellet fuels;

a fuel feeding pipeline, which connects the fuel storage chamber with the feeding mouth of combustion chamber to transport the pellet fuels stored in the fuel storage chamber to the combustion chamber.

Further, the said electric arc ignition pin is installed in the combustion chamber.

Further, a blowing mouth connected with blowing system is installed on the sidewall of the said combustion chamber. The said electric arc ignition pin is installed nearby in front of the blowing mouth. Electric arc generated by the electric arc ignition pin is stretched by the wind produced by the blowing system, and then reaches and ignites the pellet fuels.

Further, the said blowing mouth is installed beneath the feeding mouth; a striker plate is arranged between the blowing mouth and feeding mouth; the said electric arc ignition pin is installed beneath the striker plate so that the pellet fuels transported from the feeding mouth to the combustion chamber can avoid falling onto the electric arc ignition pin directly.

Wherein the said power supply equipment comprises high-frequency oscillating circuits and a transformer. The input of the said high-frequency oscillating circuits connects power source and the output connects transformer. The output of the said transformer connects to the electric arc ignition pin.

Further, the said power supply equipment is arranged on printed board in an insulating box.

The advantages of the invention are that it ignites by electric arc ignition pin which produces high-voltage electric arc, and the pellet fuels transported through the feeding mouth burn as soon as they touch the electric arc; electric arc ignition pin produces high-voltage electric arc the moment the pellet fuel combustion device starts up, which accelerates igniting speed greatly and reduces power consumption; furthermore, the fuel pellets can achieve full burning without bring on smeek. Hence, this invention has great advantages over conventional ignitions which produce heat and fire by resistance wire.

BRIEF DESCRIPTION OF DRAWINGS

The detailed description below refers to the accompanying drawings, of which:

FIG. 1 is the structural view of the pellet fuel combustion device;

FIG. 2 is the structural view of the combustion chamber;

FIG. 3 is the structural view of the power feeding equipment;

FIG. 4 is the schematic circuit diagram of the power feeding equipment; and

FIG. 5 is the right side view of the embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

With reference to FIG. 1-2, a pellet fuel combustion device of this invention comprise

a combustion chamber (1), which is used to burn pellet fuels equipped with a feeding mouth (11) on the sidewall;

a fuel delivery system, which is used to feed pellet fuels into the combustion chamber (1), the output of which connects to the feeding mouth (11).

an electric arc ignition system, which is used to produce electric arc to burn the pellet fuels delivered into the combustion chamber (1) through the fuel delivery system.

As a preferred embodiment, the said electric arc ignition system comprises

an electric arc ignition pin (4), which is used to produce electric electric arc by electric energy;

a power supply equipment (5), which is used to supply the electric arc ignition pin (4) with power.

The said fuel delivery system further comprises:

a fuel storage chamber (2), which is used to store pellet fuels;

a fuel feeding pipeline (3), which connects the fuel storage chamber (2) with the feeding mouth(11) of combustion chamber (1) to transport the pellet fuels stored in the fuel storage chamber (2) to the combustion chamber (1).

In a preferred embodiment of the invention, the said electric arc ignition pin (4) is installed in the combustion chamber (1).

Further, a blowing mouth (12) connected with blowing system (6) is installed on the sidewall of the said combustion chamber (1). The said electric arc ignition pin (4) is installed nearby in front of the blowing mouth (12). Electric arc generated by the electric arc ignition pin (4) is stretched by the wind produced by the blowing system (6), and then reaches and ignites the pellet fuels in combustion chamber (1).

Further, the said blowing mouth (12) is installed beneath the feeding mouth (11); a striker plate (13) is arranged between the blowing mouth (12) and feeding mouth (11); the said electric arc ignition pin (4) is installed beneath the striker plate (13) so that the pellet fuels transported from the feeding mouth to the combustion chamber can avoid falling onto the electric arc ignition pin (4) directly, which ensures working security.

The electric arc ignition pin (4) produces high-voltage electric arc, and the pellet fuels transported through the feeding mouth (11) burn as soon as they touch the electric arc; electric arc ignition pin (4) produces high-voltage electric arc the moment the pellet fuel combustion device starts up, which accelerates igniting speed greatly and reduces power consumption; furthermore, the fuel pellets can achieve full burning without bringing on smeek. Hence, this invention has great advantages over conventional ignitions which produce heat and fire by resistance wire.

The power supply equipment (5) can provide electric arc ignition pin (4) with power by various means. As a preferred embodiment of this invention, power supply equipment (5) comprises high-frequency oscillating circuits (51) and a transformer (52). The input of the said high-frequency oscillating circuits (51) connects power source and the output connects transformer (52). The output of the said transformer (52) connects to the electric arc ignition pin (4).

Referring to FIG. 3, the said power supply equipment (5) is preferably arranged on printed board in an insulating box, so that the power supply equipment (5) can be installed outside the combustion chamber (1) or other places with lower temperature to insure the safety of power supply. For example, an insulating box made of nylon may be used. It can be installed on the exterior sidewall of combustion chamber (1). From the power supply equipment (5) in the insulating box stretch a high-voltage wire (53) which connects the high-voltage electrode of electric arc ignition pin (4), a the ground wire (54) which connects the ground electrode of electric arc ignition pin (4), and a power line (55) which connects outer power such as 110V or 220V mains electricity. The internal elements can be chosen according to specific use.

The high-frequency oscillating circuits (51) wherein can generate high-frequency AC (alternating current) electric oscillation, and form high-frequency pulse signal as signal source for the change of voltage of the transformer (52). This can be used to select frequency, stablize frequence and protect the circuits of igniter, which can be realized in many ways. Referring to FIG. 4, in a preferred embodiment of this invention, the high-frequency oscillating circuits comprise diode 1(D1), D2; triode 1(T1), T2, T3; silicon controlled diode D3; capacitance 1(C1), C2, C3; resistance 1(R1), R2, R3, R4, R5, R6; current-limiting resistance 7(R7) and inductor (L1); L1, C1, C2, C3 together with other assorted elements generate oscillation amplified by T1 and T2 and through frequency selected by R7 and D3, then be output to transformer (52), silicon controlled diode D3 and T1, T2 also produce feedback. The specific circuits connection is as follows: the cathode of D1 connects the input of power, the anode connects parallel R1,C1 and C2, one end of R1 connects D1, the other to the transformer (52); one end of C1 connects D1, the other to the cathode of D2; one end of C2 connects D1, the other to the transformer (52) by R7; C3 is parallel to D2; the anode of D2 connects the control electrode of D3 by R3, the connection between the anode of D2 and R3 connects the connection between C2 and R7; the base region of T1 whose emitter connects the common of D2 and C3 connects C2 by R7, the connection between the emitter of T1 and the common of C2,D2 and C3 connects the base region of T2, the collector of T1 connects the emitter of T2; the emitter of T3 connects the power by L1, the connection between T3 and the inductor connects the connection between C1 and parallel D2 and C3, R6 is in parallel with the collector and the emitter of T2, the connection connects the transformer (52) by parallel R4 and R5; the anode of D3 connects the connection between emitter of T2 and collector of T1, the connection between R7 and the cathode of D3 connects transformer (52), wherein the said current-limiting resistance(R7) comprises multiple parallel resistances.

The high voltage electrode at the output of transformer (52) connects an electrode on the electric arc ignition pin (4), the other electrode of which connects the output of the ground wire. When the igniter is working, the frequency of mains electricity is converted by high-frequency oscillating circuits (51), the high voltage generated by transformer (52) is output to electric arc ignition pin (4) to generate high-voltage electricity.

Referring to FIG. 1 and FIG. 5, a pellet fuel combustion device of the invention comprises a fuel storage chamber (2) which connects to combustion chamber (1) by fuel feeding pipeline (3), wherein the transportation can be realized by using blower combined with screw propeller; the blowing system (6) can use the same power source as fuel feeding pipeline (3) does, such as using blower power to provide power); power supply equipment (5) in the insulating box is installed outside of the device where the temperature is lower, for example, it can be arranged on the exterior sidewall of combustion chamber (1) ; pellet fuels stored in storage chamber (2) are transported by fuel feeding pipeline (3) and injected into combustion chamber (1) through feeding mouth (11) Meanwhile, power supply equipment (5) converts 5V or 220V mains electricity into voltage over 100000V which is transported to electric arc ignition pin (4). As long as the distance between the two poles of electric arc ignition pin (4) is kept within 8 mm, the high voltage can generates electric arc. The blowing system (6) blows wind from the blowing mouth (12) to the electric arc generated by the electric arc ignition pin (4), and the electric arc is stretched by the wind to touch the pellet fuels inside the combustion chamber (1) to make the fuels start burning immediately. A striker plate (13) is installed between the blowing mouth (12) and feeding mouth (11), the said electric arc ignition pin (4) is installed beneath the striker plate (13) to avoid the pellet fuels falling onto the electric arc ignition pin (4) and ensure working safety.

It is sure that this invention is not limited to the embodiment above, and those that can achieve the same effects as this invention does by almost the same means should be within the scope of protection of this invention. 

1. A pellet fuel combustion device, comprising a combustion chamber, which is used to burn pellet fuels with a feeding mouth on the sidewall; a fuel delivery system, which is used to feed pellet fuels into the combustion chamber, the output of which connects to the feeding mouth; an electric arc ignition system, which is used to produce electric arc to burn the pellet fuels delivered into the combustion chamber through the fuel delivery system.
 2. The pellet fuel combustion device according to claim 1, wherein the said electric arc ignition system comprises an electric arc ignition pin, which is used to produce electric arc by electric energy; a power supply equipment, which is used to supply the electric arc ignition pin with power.
 3. The pellet fuel combustion device according to claim 1, wherein the said fuel feeding system comprises a fuel storage chamber, which is used to store pellet fuels; a fuel feeding pipeline, which connects the fuel storage chamber with the feeding mouth of combustion chambered to transport the pellet fuels stored in the fuel storage chambers to the combustion chamber.
 4. The pellet fuel combustion device according to claim 2, wherein the said electric arc ignition pin is installed in the combustion chamber.
 5. The pellet fuel combustion device according to claim 2, wherein a blowing mouth is connected with blowing system. The said electric arc ignition pin is installed nearby in front of the blowing mouth. Electric arc generated by the electric arc ignition pin is stretched by the wind produced by the blowing system, and then reaches and ignites the pellet fuels.
 6. The pellet fuel combustion device according to claim 5, wherein the said blowing mouth is installed beneath the feeding mouth; a striker plate is arranged between the blowing mouth and feeding mouth; the said electric arc ignition pin is installed beneath the striker plate so that the pellet fuels transported from the feeding mouth to the combustion chamber can avoid falling onto the electric arc ignition pin directly.
 7. The pellet fuel combustion device according to claim 2, wherein the said power supply equipment comprises high-frequency oscillating circuits and a transformer. The input of the said high-frequency oscillating circuits connects power source and the output connects transformer. The output of the said transformer connects to the electric arc ignition pin.
 8. The pellet fuel combustion device according to claim 2, wherein the said power supply equipment is preferably arranged on printed board in an insulating box.
 9. The pellet fuel combustion device according to c claim 1, wherein the high-frequency oscillating circuits comprise diode 1; triode 1; silicon controlled diode; capacitance 1; resistance 1; current-limiting resistance 7 and inductor; the cathode of diode 1 connects the input of power, the anode connects parallel resistance 1, cathode 1 and cathode 2, one end of resistance 1 connects diode 1, the other to the transformer; one end of capacitance 1 connects diode 1, the other to the cathode of diode 2; one end of capacitance 2 connects diode 1, the other to the transformer by current-limiting resistance 7; capacitance 3 is parallel to diode 2; the anode of diode 2 connects the control electrode of silicon controlled diode by resistance 3, the connection between the anode of diode 2 and resistance 3 connects the connection between capacitance 2 and current-limiting resistance 7; the base region of triode 1 whose emitter connects the common of diode 2 and capacitance 3 connects capacitance 2 by current-limiting resistance 7, the connection between the emitter of triode 1 and the common of capacitance 2, diode 2, and capacitance 3 connects the base region of triode 2, the collector of triode 1 connects the emitter of triode 2; the emitter of triode 3 connects the power by inductor, the connection between triode 3 and the inductor connects the connection between capacitance 1 and parallel diode 2 and capacitance 3, resistance 6 is in parallel with the collector and the emitter of triode 2, the connection connects the transformer by parallel resistance 4 and resistance 5: the anode of silicon controlled diode connects the connection between emitter of triode 2 and collector of triode 1, the connection between current-limiting resistance 7 and the cathode of silicon controlled diode connects transformer.
 10. The pellet fuel combustion device according to claim 9, wherein the said current-limiting resistance comprises multiple parallel resistances. 